{"id":"F2006B05160","name":"AD/CESSNA 188/25 Amdt 1 - Engine Air Inlet Duct","slug":"ad-cessna-188-25-amdt-1-engine-air-inlet-duct","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":45274,"registerId":"commonwealth-F2006B05160-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 188/25 Amdt 1 - Engine Air Inlet Duct","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Cessna 188 (Agwagon) Series Aeroplanes\n\n \n\nAD/CESSNA 188/25\n\nAmdt 1\n\n\nEngine Air Inlet Duct 6/75\n\n \n\nApplicability: All model A188 and A188B with S/Nos. 18800833 to 18801824 including those S/Nos. with a suffix \"T\".\n\n \n\nRequirement: Action in accordance with either Cessna SL SE75-5 or SL SE74-23.\n\n \n\nNote: FAA AD’s 74-23-07 and 75-09-06 refer.\n\n \n\nCompliance: Within 50 hours time in service after 12 May 1975.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original purpose of ensuring the airworthiness of Cessna 188 series engine inlet ducts."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 2 defined applicability criteria (model numbers and serial number range)","Single requirement referencing external documents (Cessna Service Letters)","Simple compliance deadline (50 hours time in service after fixed date)","No nested conditions, exceptions, or cross-references to other legislation","No interpretation section or defined terms","Straightforward binary applicability (either your aircraft is in the serial number range or it isn't)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\nOrders owners and operators of certain **Cessna 188 (Agwagon) agricultural aircraft** to inspect or fix a problem with the **engine air inlet duct** — the part that channels air into the engine. This is critical because if the duct fails, the engine could lose power or fail completely.\n\n**Who it affects:**\n- All **Cessna A188 and A188B model aircraft**\n- With **serial numbers 18800833 through 18801824** (including those with a \"T\" suffix on the serial number)\n- These are typically crop-dusting or agricultural spraying planes\n\n**What must be done:**\nOperators must follow the instructions in one of two Cessna Service Letters (SL SE75-5 or SL SE74-23) — these are manufacturer bulletins that detail the inspection or repair procedure.\n\n**When it must be done:**\nWithin **50 hours of flying time** after **12 May 1975**.\n\n**Why it matters:**\nThis directive prevents engine failures caused by defective air inlet ducts. For agricultural aircraft flying low and heavy with chemicals, an engine failure can be catastrophic. The reference to FAA ADs (American safety orders) shows this addresses a known defect also recognised in the United States."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text shows a targeted directive applying to specific A188/A188B serial numbers, prescribing compliance by reference to specific Cessna service letters within a fixed 50-hour window. There is no indication in the provided text that the scope has been broadened or narrowed from an earlier or original intent; the directive states a clear, specific applicability and requirement (Applicability; Requirement; Compliance)."},"complexity_factors":["Narrow technical scope: applies to a single component (engine air inlet duct) on specific aircraft models and serial-number range (Applicability).","External-document dependence: procedural compliance is defined by two Cessna service letters (Requirement), requiring operators to obtain and follow documents not reproduced in the directive.","Time-constrained compliance: a fixed short compliance window (50 hours time in service after 12 May 1975) increases operational planning complexity (Compliance).","Cross-references to other regulators: references to FAA ADs add secondary sources to consult (Note).","Limited substantive discretion: operators have only a binary choice between two prescribed service letters, which constrains alternative compliance approaches (Requirement)."],"plain_english_summary":"Requires specified Cessna A188/A188B (SN 18800833–18801824, including \"T\" suffixes) to have the engine air‑inlet duct modified or inspected by following either Cessna SL SE75‑5 or SL SE74‑23. Work must be done within 50 hours time‑in‑service after 12 May 1975.\n\nOwners/operators of affected aircraft must arrange and pay for the work; the AD references FAA ADs 74‑23‑07 and 75‑09‑06."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-188-25-amdt-1-engine-air-inlet-duct","history":"/api/acts/ad-cessna-188-25-amdt-1-engine-air-inlet-duct/history","analysis":"/api/acts/ad-cessna-188-25-amdt-1-engine-air-inlet-duct/analysis","conflicts":"/api/acts/ad-cessna-188-25-amdt-1-engine-air-inlet-duct/conflicts","importantCases":"/api/acts/ad-cessna-188-25-amdt-1-engine-air-inlet-duct/important-cases","documents":"/api/acts/ad-cessna-188-25-amdt-1-engine-air-inlet-duct/documents"}}